<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>IE缓存问题</title>
    <style>
        #result {
            width: 200px;
            height: 100px;
            border: solid 1px red;
        }
    </style>
</head>

<body>
    <button>点击发送请求</button>
    <div id="result"></div>
    <script>
        const btn = document.getElementsByTagName('button')[0];
        //两种选择方式二选一
        //const result = document.getElementById('result');
        const result = document.querySelector('#result');
        btn.addEventListener('click', function() {
            const xhr = new XMLHttpRequest();
            //Date.now()获取当前时间，就可以解决浏览器缓存问题
            xhr.open("GET", 'http://127.0.0.1:8000/ie?t=' + Date.now());
            xhr.send();
            xhr.onreadystatechange = function() {
                if (xhr.readyState === 4) {
                    if (xhr.status >= 200 && xhr.status < 300) {
                        result.innerHTML = xhr.response;
                    }
                }
            }
        })
    </script>
</body>

</html>